When Linda referred to "one page" in her explanations above, she meant one type of page, or perhaps more clearly, one particular code page, in this case your product_info page. The product_info code page is one part of the set of code pages which go together to display all of your products, one by one, each on its own rendered page in the browser.

[And having tried to clarify this myself, I'm beginning to get the feeling I'm sinking in quick sand. ]

Rob